From: Mark Wooding <mdw@distorted.org.uk>
Date: Thu, 21 Sep 2017 07:51:50 +0000 (+0100)
Subject: with-authinfo-kludge: Do job-control to make interrupt characters work.
X-Git-Tag: 0.1.1~1
X-Git-Url: https://git.distorted.org.uk/~mdw/with-authinfo-kludge/commitdiff_plain/8956a632bf1ee65e0af794c4ba0486bf849db339?hp=8956a632bf1ee65e0af794c4ba0486bf849db339

with-authinfo-kludge: Do job-control to make interrupt characters work.

Terminal-based newsreaders use terminal interrupt characters for their
own purposes, i.e. slrn(1) arranges that C-g is the `VINTR' character
(i.e., it sends `SIGINT' to the foreground process group).  This is bad
unless we take evasive action: it makes `slrn' go ding and cancel some
UI action, but it also wipes out `with-authinfo-kludge' and its various
helper processes, and brings the parent shell back into the foreground
where it fights `slrn' over the terminal.

Avoid this by running the client in a separate process group, pushing it
into the foreground, and proxying signals and foregroundness back and
forth to keep the shell happy.  It's all a bit ugly and desperate, but
it works well in practice and doesn't involve ignoring signals
everywhere (which was my first attempt at solving this bug).
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